Area Code 781-205 located in CAMBRIDGE, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 781 NXX (Local Number Prefix) : 205 City : CAMBRIDGE County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : READING ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 02139 Other Information NPANXX : 781205 Switch CLLI (Common Language Location Identifier) : CMBRMA01DS5 MSA CBSA (Core Based Statistical Area) : Boston-Cambridge-Quincy, MA-NH MSA CBSA Code (Core Based Statistical Area) : 14460 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : TELEPORT COMMUNICATIONS GROUP - BOSTON OCN (Operating Company Number) : 7135 Coverage Area Name : CAMBRIDGE Latitude : 42.3676 Longitude : -71.0867 ‹ previous : 781-204 next › : 781-205 Telephone Number List 781-205-0000 ~ 781-205-9999